MarekGlowacki / ascii-table

ASCII Tables for Java

ASCII Tables for Java

Easily create and customize simple ASCII tables in Java. Based off nedtwigg/asciitable and klaus31/ascii-art-table.

How to get it?

Maven:

<dependency>
  <groupId>com.github.freva</groupId>
  <artifactId>ascii-table</artifactId>
  <version>1.8.0</version>
</dependency>

Gradle:

compile 'com.github.freva:ascii-table:1.8.0'

Basic case

String[] headers = {"", "Name", "Diameter", "Mass", "Atmosphere"};
String[][] data = {
        {"1", "Mercury", "0.382", "0.06", "minimal"},
        {"2", "Venus", "0.949", "0.82", "Carbon dioxide, Nitrogen"},
        {"3", "Earth", "1.000", "1.00", "Nitrogen, Oxygen, Argon"},
        {"4", "Mars", "0.532", "0.11", "Carbon dioxide, Nitrogen, Argon"}};

System.out.println(AsciiTable.getTable(headers, data));

Will print

+---+---------+----------+------+---------------------------------+
|   | Name    | Diameter | Mass | Atmosphere                      |
+---+---------+----------+------+---------------------------------+
| 1 | Mercury |    0.382 | 0.06 |                         minimal |
+---+---------+----------+------+---------------------------------+
| 2 |   Venus |    0.949 | 0.82 |        Carbon dioxide, Nitrogen |
+---+---------+----------+------+---------------------------------+
| 3 |   Earth |    1.000 | 1.00 |         Nitrogen, Oxygen, Argon |
+---+---------+----------+------+---------------------------------+
| 4 |    Mars |    0.532 | 0.11 | Carbon dioxide, Nitrogen, Argon |
+---+---------+----------+------+---------------------------------+

Table from Collections

List<Planet> planets = Arrays.asList(
        new Planet(1, "Mercury", 0.382, 0.06, "minimal"),
        new Planet(2, "Venus", 0.949, 0.82, "Carbon dioxide, Nitrogen"),
        new Planet(3, "Earth", 1.0, 1.0, "Nitrogen, Oxygen, Argon"),
        new Planet(4, "Mars", 0.532, 0.11, "Carbon dioxide, Nitrogen, Argon"));

System.out.println(AsciiTable.getTable(planets, Arrays.asList(
        new Column().with(planet -> Integer.toString(planet.num)),
        new Column().header("Name").with(planet -> planet.name),
        new Column().header("Diameter").with(planet -> String.format("%.03f", planet.diameter)),
        new Column().header("Mass").with(planet -> String.format("%.02f", planet.mass)),
        new Column().header("Atmosphere").with(planet -> planet.atmosphere))));

Prints the same table as above.

Column alignments

Horizontally align header and data columns independently to left, right and center:

System.out.println(AsciiTable.getTable(planets, Arrays.asList(
        new Column().with(planet -> Integer.toString(planet.num)),
        new Column().header("Name").headerAlign(HorizontalAlign.CENTER).dataAlign(HorizontalAlign.LEFT).with(planet -> planet.name),
        new Column().header("Diameter").with(planet -> String.format("%.03f", planet.diameter)),
        new Column().header("Mass").with(planet -> String.format("%.02f", planet.mass)),
        new Column().header("Atmosphere").headerAlign(HorizontalAlign.RIGHT).dataAlign(HorizontalAlign.CENTER).with(planet -> planet.atmosphere))));

Prints

+---+---------+----------+------+---------------------------------+
|   |  Name   | Diameter | Mass |                      Atmosphere |
+---+---------+----------+------+---------------------------------+
| 1 | Mercury |    0.382 | 0.06 |             minimal             |
+---+---------+----------+------+---------------------------------+
| 2 | Venus   |    0.949 | 0.82 |    Carbon dioxide, Nitrogen     |
+---+---------+----------+------+---------------------------------+
| 3 | Earth   |    1.000 | 1.00 |     Nitrogen, Oxygen, Argon     |
+---+---------+----------+------+---------------------------------+
| 4 | Mars    |    0.532 | 0.11 | Carbon dioxide, Nitrogen, Argon |
+---+---------+----------+------+---------------------------------+

Min/max column width

Limit any column to certain width:

System.out.println(AsciiTable.getTable(planets, Arrays.asList(
        new Column().minWidth(5).with(planet -> Integer.toString(planet.num)),
        new Column().header("Name").with(planet -> planet.name),
        new Column().header("Diameter").with(planet -> String.format("%.03f", planet.diameter)),
        new Column().header("Mass").with(planet -> String.format("%.02f", planet.mass)),
        new Column().header("Atmosphere Composition").maxWidth(12).with(planet -> planet.atmosphere))));

Prints

+-----+---------+----------+------+--------+
|     | Name    | Diameter | Mass | Atmosp |
|     |         |          |      | here   |
+-----+---------+----------+------+--------+
|   1 | Mercury |    0.382 | 0.06 | minima |
|     |         |          |      |      l |
+-----+---------+----------+------+--------+
|   2 |   Venus |    0.949 | 0.82 | Carbon |
|     |         |          |      | dioxid |
|     |         |          |      |     e, |
|     |         |          |      | Nitrog |
|     |         |          |      |     en |
+-----+---------+----------+------+--------+
|   3 |   Earth |    1.000 | 1.00 | Nitrog |
|     |         |          |      |    en, |
|     |         |          |      | Oxygen |
|     |         |          |      |      , |
|     |         |          |      |  Argon |
+-----+---------+----------+------+--------+
|   4 |    Mars |    0.532 | 0.11 | Carbon |
|     |         |          |      | dioxid |
|     |         |          |      |     e, |
|     |         |          |      | Nitrog |
|     |         |          |      |    en, |
|     |         |          |      |  Argon |
+-----+---------+----------+------+--------+

Controlling overflow behaviour

By default when a cell reaches max column width, a newline is inserted before remainder of the text. Other possible behaviours are clipping and ellipsis:

System.out.println(AsciiTable.getTable(planets, Arrays.asList(
        new Column().header("Atmosphere Composition").maxWidth(12, OverflowBehaviour.NEWLINE).with(planet -> planet.atmosphere),
        new Column().header("Atmosphere Composition").maxWidth(12, OverflowBehaviour.CLIP_LEFT).with(planet -> planet.atmosphere),
        new Column().header("Atmosphere Composition").maxWidth(12, OverflowBehaviour.CLIP_RIGHT).with(planet -> planet.atmosphere),
        new Column().header("Atmosphere Composition").maxWidth(12, OverflowBehaviour.ELLIPSIS_LEFT).with(planet -> planet.atmosphere),
        new Column().header("Atmosphere Composition").maxWidth(12, OverflowBehaviour.ELLIPSIS_RIGHT).with(planet -> planet.atmosphere))));

Prints

+------------+------------+------------+------------+------------+
| Atmosphere | omposition | Atmosphere | …mposition | Atmospher… |
| Compositio |            |            |            |            |
| n          |            |            |            |            |
+------------+------------+------------+------------+------------+
|    minimal |    minimal |    minimal |    minimal |    minimal |
+------------+------------+------------+------------+------------+
|     Carbon | , Nitrogen | Carbon dio | … Nitrogen | Carbon di… |
|   dioxide, |            |            |            |            |
|   Nitrogen |            |            |            |            |
+------------+------------+------------+------------+------------+
|  Nitrogen, | gen, Argon | Nitrogen,  | …en, Argon | Nitrogen,… |
|    Oxygen, |            |            |            |            |
|      Argon |            |            |            |            |
+------------+------------+------------+------------+------------+
|     Carbon | gen, Argon | Carbon dio | …en, Argon | Carbon di… |
|   dioxide, |            |            |            |            |
|  Nitrogen, |            |            |            |            |
|      Argon |            |            |            |            |
+------------+------------+------------+------------+------------+

Bonus: The original line breaks are always preserved, so you can split your text however you want before making the table.

Footer

Special row at the end of the table that can be used to for example repeat the header if the table is really long, or display some summary information such as average or totals.

System.out.println(AsciiTable.getTable(planets, Arrays.asList(
        new Column().with(planet -> Integer.toString(planet.num)),
        new Column().header("Name").footer("Average").headerAlign(CENTER).dataAlign(RIGHT).with(planet -> planet.name),
        new Column().header("Diameter").headerAlign(RIGHT).dataAlign(CENTER).footerAlign(CENTER)
                .footer(String.format("%.03f", planets.stream().mapToDouble(planet -> planet.diameter).average().orElse(0)))
                .with(planet -> String.format("%.03f", planet.diameter)),
        new Column().header("Mass").headerAlign(RIGHT).dataAlign(LEFT)
                .footer(String.format("%.02f", planets.stream().mapToDouble(planet -> planet.mass).average().orElse(0)))
                .with(planet -> String.format("%.02f", planet.mass)),
        new Column().header("Atmosphere").headerAlign(LEFT).dataAlign(CENTER).with(planet -> planet.atmosphere))));

Prints

+---+---------+----------+------+---------------------------------+
|   |  Name   | Diameter | Mass | Atmosphere                      |
+---+---------+----------+------+---------------------------------+
| 1 | Mercury |  0.382   | 0.06 |             minimal             |
+---+---------+----------+------+---------------------------------+
| 2 |   Venus |  0.949   | 0.82 |    Carbon dioxide, Nitrogen     |
+---+---------+----------+------+---------------------------------+
| 3 |   Earth |  1.000   | 1.00 |     Nitrogen, Oxygen, Argon     |
+---+---------+----------+------+---------------------------------+
| 4 |    Mars |  0.532   | 0.11 | Carbon dioxide, Nitrogen, Argon |
+---+---------+----------+------+---------------------------------+
|   | Average |  0.716   | 0.50 |                                 |
+---+---------+----------+------+---------------------------------+

Builder

Using the builder from AsciiTable.builder() you can customize the table further, e.g. setting the line separator or outputting the table to an OutputStream:

try (OutputStream fos = Files.newOutputStream(Paths.get("table.txt"))) {
    AsciiTable.builder()
            .lineSeparator("\r\n")
            .border(AsciiTable.BASIC_ASCII_NO_OUTSIDE_BORDER)
            .data(planets, Arrays.asList(
                    new Column().with(planet -> Integer.toString(planet.num)),
                    new Column().header("Name").footer("Average").headerAlign(CENTER).dataAlign(RIGHT).with(planet -> planet.name),
                    new Column().header("Diameter").headerAlign(RIGHT).dataAlign(CENTER).footerAlign(CENTER)
                            .footer(String.format("%.03f", planets.stream().mapToDouble(planet -> planet.diameter).average().orElse(0)))
                            .with(planet -> String.format("%.03f", planet.diameter)),
                    new Column().header("Mass").headerAlign(RIGHT).dataAlign(LEFT)
                            .footer(String.format("%.02f", planets.stream().mapToDouble(planet -> planet.mass).average().orElse(0)))
                            .with(planet -> String.format("%.02f", planet.mass)),
                    new Column().header("Atmosphere").headerAlign(LEFT).dataAlign(CENTER).with(planet -> planet.atmosphere)))
            .writeTo(fos);
}

Border styles

Character[] borderStyle = ...;
System.out.println(AsciiTable.getTable(borderStyles, planets, Arrays.asList(
        new Column().with(planet -> Integer.toString(planet.num)),
        new Column().header("Name").footer("Average").headerAlign(CENTER).dataAlign(RIGHT).with(planet -> planet.name),
        new Column().header("Diameter").headerAlign(RIGHT).dataAlign(CENTER).footerAlign(CENTER)
                .footer(String.format("%.03f", planets.stream().mapToDouble(planet -> planet.diameter).average().orElse(0)))
                .with(planet -> String.format("%.03f", planet.diameter)),
        new Column().header("Mass").headerAlign(RIGHT).dataAlign(LEFT)
                .footer(String.format("%.02f", planets.stream().mapToDouble(planet -> planet.mass).average().orElse(0)))
                .with(planet -> String.format("%.02f", planet.mass)),
        new Column().header("Atmosphere").headerAlign(LEFT).dataAlign(CENTER).with(planet -> planet.atmosphere))));

Default style is AsciiTable.BASIC_ASCII

---

With borderStyle = AsciiTable.BASIC_ASCII_NO_OUTSIDE_BORDER, it prints

   |  Name   | Diameter | Mass | Atmosphere                      
---+---------+----------+------+---------------------------------
 1 | Mercury |  0.382   | 0.06 |             minimal             
---+---------+----------+------+---------------------------------
 2 |   Venus |  0.949   | 0.82 |    Carbon dioxide, Nitrogen     
---+---------+----------+------+---------------------------------
 3 |   Earth |  1.000   | 1.00 |     Nitrogen, Oxygen, Argon     
---+---------+----------+------+---------------------------------
 4 |    Mars |  0.532   | 0.11 | Carbon dioxide, Nitrogen, Argon 
---+---------+----------+------+---------------------------------
   | Average |  0.716   | 0.50 |                                 

---

With borderStyle = AsciiTable.BASIC_ASCII_NO_DATA_SEPARATORS, it prints

+---+---------+----------+------+---------------------------------+
|   |  Name   | Diameter | Mass | Atmosphere                      |
+---+---------+----------+------+---------------------------------+
| 1 | Mercury |  0.382   | 0.06 |             minimal             |
| 2 |   Venus |  0.949   | 0.82 |    Carbon dioxide, Nitrogen     |
| 3 |   Earth |  1.000   | 1.00 |     Nitrogen, Oxygen, Argon     |
| 4 |    Mars |  0.532   | 0.11 | Carbon dioxide, Nitrogen, Argon |
+---+---------+----------+------+---------------------------------+
|   | Average |  0.716   | 0.50 |                                 |
+---+---------+----------+------+---------------------------------+

---

With borderStyle = AsciiTable.BASIC_ASCII_NO_DATA_SEPARATORS_NO_OUTSIDE_BORDER, it prints

   |  Name   | Diameter | Mass | Atmosphere                      
---+---------+----------+------+---------------------------------
 1 | Mercury |  0.382   | 0.06 |             minimal             
 2 |   Venus |  0.949   | 0.82 |    Carbon dioxide, Nitrogen     
 3 |   Earth |  1.000   | 1.00 |     Nitrogen, Oxygen, Argon     
 4 |    Mars |  0.532   | 0.11 | Carbon dioxide, Nitrogen, Argon 
---+---------+----------+------+---------------------------------
   | Average |  0.716   | 0.50 |                                 

---

With borderStyle = AsciiTable.NO_BORDERS, it prints

     Name    Diameter  Mass  Atmosphere                      
 1  Mercury   0.382    0.06              minimal             
 2    Venus   0.949    0.82     Carbon dioxide, Nitrogen     
 3    Earth   1.000    1.00      Nitrogen, Oxygen, Argon     
 4     Mars   0.532    0.11  Carbon dioxide, Nitrogen, Argon 
    Average   0.716    0.50                                  

---

With borderStyle = AsciiTable.FANCY_ASCII, it prints

╔═══╤═════════╤══════════╤══════╤═════════════════════════════════╗
║   │  Name   │ Diameter │ Mass │ Atmosphere                      ║
╠═══╪═════════╪══════════╪══════╪═════════════════════════════════╣
║ 1 │ Mercury │  0.382   │ 0.06 │             minimal             ║
╟───┼─────────┼──────────┼──────┼─────────────────────────────────╢
║ 2 │   Venus │  0.949   │ 0.82 │    Carbon dioxide, Nitrogen     ║
╟───┼─────────┼──────────┼──────┼─────────────────────────────────╢
║ 3 │   Earth │  1.000   │ 1.00 │     Nitrogen, Oxygen, Argon     ║
╟───┼─────────┼──────────┼──────┼─────────────────────────────────╢
║ 4 │    Mars │  0.532   │ 0.11 │ Carbon dioxide, Nitrogen, Argon ║
╠═══╪═════════╪══════════╪══════╪═════════════════════════════════╣
║   │ Average │  0.716   │ 0.50 │                                 ║
╚═══╧═════════╧══════════╧══════╧═════════════════════════════════╝

---

Border styles is a Character array of length 29 and you can configure your own styles by passing in different array. To see which element in Character array corresponds to which element in the table:

Character[] borderStyles = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123".chars().mapToObj(c -> (char)c).toArray(Character[]::new);

Prints

ABBBCBBBBBBBBBCBBBBBBBBBBCBBBBBBCBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBD
E   F  Name   F Diameter F Mass F Atmosphere                      G
HIIIJIIIIIIIIIJIIIIIIIIIIJIIIIIIJIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIK
L 1 M Mercury M  0.382   M 0.06 M             minimal             N
OPPPQPPPPPPPPPQPPPPPPPPPPQPPPPPPQPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPR
L 2 M   Venus M  0.949   M 0.82 M    Carbon dioxide, Nitrogen     N
OPPPQPPPPPPPPPQPPPPPPPPPPQPPPPPPQPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPR
L 3 M   Earth M  1.000   M 1.00 M     Nitrogen, Oxygen, Argon     N
OPPPQPPPPPPPPPQPPPPPPPPPPQPPPPPPQPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPR
L 4 M    Mars M  0.532   M 0.11 M Carbon dioxide, Nitrogen, Argon N
STTTUTTTTTTTTTUTTTTTTTTTTUTTTTTTUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTV
W   X Average X  0.716   X 0.50 X                                 Y
Z111211111111121111111111211111121111111111111111111111111111111113